Patent GB-524623-A (GB)
Title: Improvements in or relating to resinous condensation products
IPC: C08G12/42
Filed: 1939-01-03
Abstract: 524,623. Resinous condensation products. TATTERSALL, H. J. and IMPERIAL CHEMICAL INDUSTRIES, Ltd. Jan. 3, 1939, No. 202. [Class 2 (iii)] Resins are prepared by condensing, in the presence of an acid catalyst having a dissociation constant of at least 10-<SP>3</SP> and in the absence of water, a primary alcohol, a solid polymer of formaldehyde, and an amide-formaldehyde condensate containing at least one methyleneimino group per molecule, in such proportions that the molar ratio of formaldehyde polymer (calculated as monomer) to condensate (calculated as monomer) is at least equal to the number of methylene-imino groups in the monomeric form of the condensate, and the molar ration of alcohol to condensate is at least equal to the said number of methylene-imino groups divided by the number of primary alcoholic groups in the alcohol molecule. In a modification, the amide-formaldehyde condensate is prepared in situ from an amide and from formaldehyde polymer beyond that required for the above proportions. The condensation may be carried out at 120-140‹ C. There are specified : catalysts-phosphoric, oxalic, trichloracetic, and hydrochloric acids ; formaldehyde polymers-paraformaldehyde and trioxymethylene ; alcohols-methyl, ethyl, n- and iso-butyl, amyl, cyclohexyl, and benzyl alcohols, ethyleneglycol monoethyl ether, ethyleneglycol, and glycerol ; amides-acetamide, urethane, urea, guanidine, semicarbazide, biuret, and their thio- and mono-N-substituted derivatives, such as alkyl ureas and aryl ureas including ureides of alkyl hydrogen phthalates, also methylol methylene, and polymethylene derivatives of the foregoing, and the products of Specification 514,989. The products are soluble in organic solvents, e.g. acetone, methanol, mixtures of alcohol and benzene, and compatible with cellulose derivatives such as nitrocellulose, with polyvinyl compounds, e.g. polyacrylic and polymethacrylic compounds, and with vulcanized or unvulcanized rubber. In examples the following are condensed in the presence of phosphoric acid : 1 mol. of polymethylene urethane, 1 mol. paraformaldehyde, and 1 mol. benzyl alcohol or ¢ mol. of ethyleneglycol ; 1 mol. of the product of example 1 of Specification 514,989, 1 mol. of paraformaldehyde, and 1 mol. of benzyl alcohol; 1 mol. of polymethylene urea, 2 mols. paraformaldehyde, and 2 mols. benzyl alcohol ; 1 mol. urea, 4 mols. paraformaldehyde, and 2 mols. benzyl alcohol ; 1 mol. monomethyl urea, 2 mols. paraformaldehyde, and 1 mol. benzyl alcohol; 1 mol. polymethylene methylurea, 1 mol. paraformaldehyde, and 1 mol. benzyl alcohol or ¢ mol. ethyleneglycol ; 2 mols. polymethylene acetamide, 2 mols. paraformaldehyde, and 1 mol. ethyleneglycol; and (10) 1 mol. urea, 4 mols. paraformaldehyde, and 2 mols. methanol. The product of example 10 is compatible with polyhydric alcohols, e.g. ethylene- or propyleneglycol, diethyleneglycol, glycerol, with plasticizers and lacquer ingredients, e.g. tung oil, rosin, ester gum. An example of a filmforming composition, including nitro-cellulose, is also given.